Grandview Trail, Grand Canyon National Park

Unlike other South Rim footpaths that pick their way down dark drainages, this aptly named route stays in the open, allowing constant canyon views. It's also narrow and steep--a stiff challenge coming back up. From the Grandview Point trailhead to a Colorado River overlook on Horseshoe Mesa, and back, you'll hike 8 miles. Go any season but high summer.